package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        log.info("上传图片");
        //原始文件名
        String filename = file.getOriginalFilename();
        //动态截取后缀名
        String suffix=filename.substring(filename.lastIndexOf("."));

        //使用UUID重新命名
        filename= UUID.randomUUID().toString()+suffix;

        //创建一个目录对象
        File dir=new File(basePath);
        if(!dir.exists()){
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath+filename));
        } catch (IOException e) {
            e.printStackTrace();
        }

        return R.success(filename);
    }
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream=new FileInputStream(new File(basePath+name));

            //输出流，将文件写入浏览器展示图片
            ServletOutputStream outputStream = response.getOutputStream();


            response.setContentType("image/jpeg");

            int len=0;
            byte[] bytes=new byte[1024];
            while ((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            fileInputStream.close();
            outputStream.close();

        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}
